1) Remove the ashtray and the two outermost screws exposed in the ashtray cavity.2) Remove two screws from each side of the dash console.3) Remove the climate control knobs.4) Unclip the trim bezel and remove.5) Remove four screws securing the car stereo to the dash.6) Pull car stereo from console releasing antenna and connectors.

Constant 12V+Red

Switched 12V+Orange/Yellow

GroundBlack

IlluminationRed/Green

DimmerGreen/Red

AntennaDriver's Pillar

Front Speakers6 1/2" Doors

Left Front (+)Orange

Left Front (-)Black

Right Front (+)Gray

Right Front (-)Green

Rear Speakers4" Tail Gate

Left Rear (+)White

Left Rear (-)Red

Right Rear (+)Yellow

Right Rear (-)Blue http://www.tehnomagazin.com/Auto-radio-car-connector/KENWOOD-Car-Radio-Wiring-Connector.htm for the deck
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1) Remove the ashtray and the two outermost screws exposed in the ashtray cavity.2) Remove two screws from each side of the dash console.3) Remove the climate control knobs.4) Unclip the trim bezel and remove.5) Remove four screws securing the car stereo to the dash.6) Pull car stereo from console releasing antenna and connectors.

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is this a new install.
if yes, buy the adapter harness, all auto stores sell this.
makes connections easy and has ,"instructions"
the red wire to the new head is red, and most go to the correct
harness wire, for radio power, on the geo that is RADIO fuse.
that goes to ignition on , connection. so fuse must be hot.
and key on. and radio grounded (black) to play
your car is a toyota corolla in snake skins. (badged)

that is true.
but some cars running obd1 , can be scanned,. (i have one)
like all GM cars and even older, , some ford, , Honda's . Toyota;s
but this car is GEO, (underdog, but is really what. a Isusu.)
Isuzu's cars are mostly not raced or sold here now. so who's going to make scanner for such a rare car and engine and EFI?
there is no OBD1 standard, each company uses a unique design.
then,... so...
OBD2, in 1996 a USA invention is a standard and all tools work.
so....
what you have is the old blink codes. wink wink...
all OBD1 cars work like this (or very close)
you connect a jumper wire, and the CEL lamp flashes codes.
so is the CEL stuck on? running.
must come on key on, bad lamp or bad ECU.

Example storm post..OBD1991 (USA)
To put the ECM (Engine Control Module/Ignition Control Module/Engine Computer) into diagnostic mode, where it will flash codes at you using the "MIL" (Malfunction Indicator Light or "Check Engine" light), short pins 1 and 3 of the ALDL/OBD1 connector using a paperclip. When you then turn the key into the on position, the MIL should flash once, then pause a bit, then flash twice. That means code "12." If there are other codes, they will be flashed out as well. All codes are two digits.
end quote, on storm

but where is the connector DLC?
and which pin is 1 an 3
so. we google more, or look it up in alldata.com like most do.

sounds like your ignition switch has gone bad or the connection on your starter......had the same problem in a 91 geo storm a 2000 chevy pickup and the starter issue in my 72 chevelle....i know they aren't the same vehicle but other than checking all of the fuses the ignition switch will render your car useless as well